From d5d0d430dbfc97ebf640c534d02a92c130ad5dc9 Mon Sep 17 00:00:00 2001
From: "siemen.liuxm" <siemen.liuxm@alibaba-inc.com>
Date: Sat, 7 Jun 2014 16:08:01 +0800
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 source/chapter2/12_Subscripts.md | 2 +-
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diff --git a/source/chapter2/12_Subscripts.md b/source/chapter2/12_Subscripts.md
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@@ -1,3 +1,3 @@
 # 下标 (Subscripts)
 
-类、结构体和枚举都可以定义下标，可以认为是访问对象、集合或序列的快捷方式。
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+类(Class)、结构体(structures)和枚举(enumerations)都可以定义下标，可以认为是访问对象、集合或序列的快捷方式。举例来说，用下标访问一个数组(Array)实例中的元素可以这样写 `someArray[index]` ，访问字典(Dictionary)实例中的元素可以这样写 `someDictionary[key]`，而不需要再调用实例的某个方法来获得元素的值。
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